Actually _PASS IN_ NO_RESERVE if we have it.

Thanks to Brian for fixing this obvious oops


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8899 91177308-0d34-0410-b5e6-96231b3b80d8

lib/ExecutionEngine/JIT/JITEmitter.cpp

@@ -71,7 +71,7 @@ static void *getMemory(unsigned NumBytes) {
 #endif
 
   void *pa = mmap(0, pageSize*NumPages, PROT_READ|PROT_WRITE|PROT_EXEC,
-                  MAP_PRIVATE|MAP_ANONYMOUS, fd, 0);
+                  mmapFlags, fd, 0);
   if (pa == MAP_FAILED) {
     perror("mmap");
     abort();